TITLE:   GCN CIRCULAR
NUMBER:  26582
SUBJECT: Fermi  trigger No 598988276: Global MASTER-Net observations report 
DATE:    19/12/25 18:00:17 GMT
FROM:    Vladimir Lipunov at Moscow State U/Krylov Obs  <lipunov@xray.sai.msu.ru>

V. Lipunov, E. Gorbovskoy, V.Kornilov, N.Tyurina, P.Balanutsa, A.Kuznetsov, F.Balakin, 
V.Vladimirov, D. Vlasenko, I.Gorbunov, D.Zimnukhov, V.Senik, T.Pogrosheva,
D.Kuvshinov,  D. Cheryasov
(Lomonosov Moscow State University, SAI, Physics Department),

R. Podesta, C.Lopez, F. Podesta, C.Francile 
(Observatorio Astronomico Felix Aguilar OAFA),

H.Levato 
(Instituto de Ciencias Astronomicas, de la Tierra y del Espacio ICATE),

R. Rebolo, M. Serra 
(The Instituto de Astrofisica de Canarias),

D. Buckley 
(South African Astronomical Observatory),

O.A. Gres, N.M. Budnev, O.Ershova 
(Irkutsk State University, API),

A. Tlatov, D. Dormidontov 
(Kislovodsk Solar Station of the Pulkovo Observatory),

V. Yurkov, A. Gabovich, Yu. Sergienko 
(Blagoveschensk Educational State University)




MASTER-Amur robotic telescope  (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L)  located in Russia (Blagoveshchensk State Pedagogical University) started inspect of the Fermi GRB191225.73 (trigger No 598988276,09h 43m 12.00s , -07d 10m 48.0s, R=2.84) errorbox  538 sec after notice time and 571 sec after trigger time at 2019-12-25 17:47:23 UT, with upper limit up to  17.0 mag. The observations began at zenith distance = 59 deg. The sun  altitude  is -52.4 deg. 

The galactic latitude b = 33 deg., longitude l = 244 deg.


Real time updated cover map and OT discovered available here: 
https://master.sai.msu.ru/site/master2/observ.php?id=1239771

We obtain a following upper limits.  

Tmid-T0  |      Date Time      |          Site       |             Coord (J2000)          |Filt.| Expt. | Limit| Comment
_________|_____________________|_____________________|____________________________________|_____|_______|_______|________

     602 | 2019-12-25 17:47:23 |         MASTER-Amur | (09h 47m 58.39s , -07d 05m 40.2s) |   C |    60 | 16.8 |        
     681 | 2019-12-25 17:48:43 |         MASTER-Amur | (09h 47m 55.51s , -07d 04m 47.6s) |   C |    60 | 16.9 |        
     761 | 2019-12-25 17:50:02 |         MASTER-Amur | (09h 48m 00.22s , -07d 05m 51.5s) |   C |    60 | 17.0 |        
     840 | 2019-12-25 17:51:21 |         MASTER-Amur | (09h 47m 55.59s , -07d 06m 54.7s) |   C |    60 | 17.0 |        
Filter C is a clear (unfiltred) band. 


The observation and reduction will continue. 
The message may be cited.